Tuesday "Did You Hear That?"

What does the illustration under paragraph 2 help the reader to understand?

16. Which two quotations provide support for the main idea that echolocation is an important sense for bats and dolphins?

• A “They rely on sound waves and echoes, which allow them to ‘see’ in the dark.” (paragraph 1)
• B “Bats use their larynx, or voice box, to produce high-frequency sounds.” (paragraph 2)
• C “Dolphins produce sound through their nasal area.” (paragraph 7)
• D “Dolphins don’t have external ears like bats do.” (paragraph 8)
• E “With sonar, dolphins can locate ‘dinner’ hidden deep below the ocean’s floor.” (paragraph 9)

17. Which phrase from paragraph 3 helps the reader understand the meaning of the word detect?

• A “...can locate objects...”
• B “...60 feet away.”
• C “...something as thin...”
• D “...a human hair.”

18. What overall text structure do the authors use in the text?

• A The authors use cause and effect to show how sound waves bounce off of objects to make echoes.
• B The authors use chronological order to show how scientists have changed the ways they study echolocation.
• C The authors use compare and contrast to show how bats and dolphins each use echolocation to find food.
• D The authors use problem and solution to show how fishermen and dolphins work together to catch fish.

19. What do the authors mean by the phrase “on cue” in paragraph 10?

• A The fishermen work together as a team.
• B The fishermen are surprised by the dolphins.
• C The fishermen act at exactly the right moment.
• D The fishermen have some trouble doing the work.

20. How are dolphins able to hear under water?

• A Dolphins use their snouts to listen for prey in the water near the ocean floor.
• B Dolphins feel echoes in parts of their heads to know where objects are in the water.
• C Dolphins move their heads to sense echoes in the water around them.
• D Dolphins use their phonic lips to determine where objects are located in the water.

22. What makes sonar used by dolphins different from echolocation used by bats?

• A It takes place under water.
• B It helps find very tiny objects.
• C It helps identify objects that are far away.
• D It gives a more detailed picture of what is ahead.